
An overbank is an alluvial geological deposit consisting of sediment that has been deposited on the floodplain of a river or stream by flood waters that have broken through or overtopped the banks. The sediment is carried in suspension, and because it is carried outside of the main channel, away from faster flow, the sediment is typically fine-gra...
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http://en.wikipedia.org/wiki/Overbank

to have the balance staff oscillate so greatly that the fork of the lever fails to engage, rendering the escapement inoperative.
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https://www.infoplease.com/dictionary/overbank
No exact match found.